THE geology of Cwm Idwal and its links with Charles Darwin will be explained during a guided walk as part of Bangor University’s Science Festival celebrations.

The walk is on Sunday, March 11 at 2pm. Other events include The Hidden Worlds exhibition on Saturday March 17, where people can see images from inside a fly’s brain or discover the wonders of DNA. Wild Science at Treborth Botanic Garden on Sunday, March 18 promises a bird's eye view of Treborth woodland.